Question

Which cell does not have perforated cell wall ?

• A. Tracheids
• B. Companion cells
• C. Sieve tubes
• D. Vessels

Answer 1

The correct option is A

Tracheids

The correct option is A

Explanation of correct option:

1. A perforated cell wall means a cell wall has small holes. The wall of cells of the xylem and phloem are modified into the perforated cell walls.
2. Tracheids are dead cells having a tube-like shape with a tapering end and they do not have perforated cell walls.
3. They are primarily present in lower angiosperm and gymnosperm.
4. Tracheids do not contain protoplasm and they have a thick lignified wall.
5. Function: The main function of tracheids is water and mineral transportation.

Explanation of incorrect options:

Option B

1. Companion cells- Phloem tissue consists of two kinds of cells, sieve tubes, and companion cells.
2. They both have perforated cell walls. They are generally parenchyma cells found in the phloem tissues of the angiosperms.

Option C

The sieve tubes are cylindrical tube-like structures made up of perforated cells.

Option D

Vessels are part of xylem tissue and they also have perforated cell walls. So, this option is incorrect.

Final Answer: Tracheids do not have perforated cell walls.